看似简单的问题,三相半波整流电路,有谁断一下?

说法一:
三相半波不可控整流电路 :
    三相电压的瞬时值表达式为
          uU =√2 U2 sinωt
         uV =√2 U2 sin(ωt-2π/3)
         uW =√2 U2 sin(ωt+2π/3)
         UVD1M =√6 U2
       输出直流平均电压Ud 为
               Ud =3/2π    √2 U2 sinωtd(ωt)
                  =(3√6/2π) U2 =1.17 U2
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说法二:
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